Ink-jet head and printer

Abstract

In accordance with an embodiment, an ink-jet head is provided which comprises a substrate; a piezoelectric body configured to have a plurality of parallel partition walls at the same pitch interval in the nozzle arrangement direction on the substrate and be plurally arranged in a direction orthogonal to the nozzle arrangement direction; a frame body configured to be arranged on the substrate at the outside of the piezoelectric body; and a nozzle plate configured to have a plurality of discharge openings which is formed by shifting by a half pitch in the nozzle arrangement direction in each row of pressure chambers formed with plural rows by the frame body and a plurality of the partition walls and is respectively formed in the orthogonal direction at a pitch identical to the pitch in each the pressure chamber.

What is claimed is: 
     
       1. An ink-jet head, comprising:
 a substrate; 
 a piezoelectric body configured to have a plurality of parallel partition walls at the same pitch interval in the nozzle arrangement direction on the substrate and be plurally arranged in a direction orthogonal to the nozzle arrangement direction; 
 a frame body configured to be arranged on the substrate at the outside of the piezoelectric body; and 
 a nozzle plate configured to have a plurality of discharge openings which is formed by shifting by a half pitch in the nozzle arrangement direction in each row of pressure chambers formed with plural rows by the frame body and a plurality of the partition walls and is respectively formed in the orthogonal direction at a pitch identical to the pitch in each the pressure chamber; and 
 a common liquid chamber configured to be arranged by internal surfaces of the frame body, principal surfaces of the substrate and rear surfaces of the nozzle plate; 
 wherein the common liquid chamber is communicated with a plurality of first holes for supplying ink, with a plurality of second holes for discharging ink. 
 
     
     
       2. The ink-jet head according to  claim 1 , wherein the piezoelectric body is equipped with rear surface of the nozzle plate, pair of the adjacent partition walls among the plural partition walls in the nozzle arrangement direction, groove bottom between partition walls, and a conductive film on the groove bottom and partition wall surfaces of the partition walls. 
     
     
       3. A printer, comprising:
 an ink-jet head configured to include a piezoelectric body which has a plurality of parallel partition walls at a pitch interval in a horizontal scanning direction respectively and is plurally arranged in a vertical scanning direction orthogonal to the horizontal scanning direction, and a nozzle plate which has a plurality of discharge openings which is formed by shifting by a half pitch in the horizontal scanning direction in each row of pressure chambers formed with plural rows by the frame body on a substrate and the piezoelectric body and is respectively formed in the vertical scanning direction at a pitch identical to the pitch in each the pressure chamber; 
 a common liquid chamber configured to be arranged by internal surfaces of the frame body, principal surfaces of the substrate and rear surfaces of the nozzle plate; 
 wherein the common liquid chamber is communicated with a plurality of first holes for supplying ink, with a plurality of second holes for discharging ink; 
 a conveyance roller configured to convey an image receiving medium to the ink-jet head relatively; and 
 a controller configured to control the driving of the conveyance roller. 
 
     
     
       4. The printer according to  claim 3 , wherein the controller sets a value obtained by multiplying hole opening quantity of the discharge openings in the vertical scanning direction by a paper feed speed of the image receiving medium in the vertical scanning direction through the conveyance roller as a printing density in horizontal scanning direction. 
     
     
       5. The printer according to  claim 4 , wherein the controller controls to drive each pressure chamber of the piezoelectric body to jet droplets at a certain times equal to hole opening quantity of the discharge openings in the vertical scanning direction for the same pixel in a case in which the paper feed speed of the image receiving medium in the vertical scanning direction through the conveyance roller is identical to the printing density in the horizontal scanning direction. 
     
     
       6. The printer according to  claim 3 , wherein the controller controls to drive each pressure chamber of the piezoelectric body to jet droplets at a certain times equal to hole opening quantity of the discharge openings in the vertical scanning direction for the same pixel in a case in which the paper feed speed of the image receiving medium in the vertical scanning direction through the conveyance roller is identical to the printing density in the horizontal scanning direction.